How do you calculate kJ per mole?

How do you calculate energy in kilojoules per mole?

The conversion to kJ/mol involves using Avogadro’s number and converting J to kJ: E (kJ/mol) = (3.713 × 1019 J/photon)(6.022 × 1023 photon/mol)(103kJ/J) = 224 kJ/mol.

How do you calculate energy released per mole?

Key Concepts

  1. Amount of energy released or absorbed is calculated. q = m × Cg × ΔT. q = amount of energy released or absorbed. …
  2. calculate moles of solute. n = m ÷ M. n = moles of solute. …
  3. Amount of energy (heat) released or absorbed per mole of solute is calculated. ΔHsoln = q ÷ n. ΔHsoln = molar enthalpy (heat) of solution.

How do you find kJ mol from kJ?

Calculating energy changes

  1. = 100 × 4.2 × 20 = 8,400 J.
  2. It is also useful to remember that 1 kilojoule, 1 kJ, equals 1,000 J. …
  3. Moles of propane burned = 0.5 ÷ 44 = 0.01136.
  4. So, the molar enthalpy change, ∆H = 8.4 ÷ 0.01136 = 739 kJ/mol.

How many joules is in a Kilojoule?

Kilojoules to joules conversion table

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Energy (kJ) Energy (J)
1 kJ 1000 J
2 kJ 2000 J
3 kJ 3000 J
4 kJ 4000 J

How do you convert joules to kJ mol?

Accepted book enthalpies are in the units kJ/mol. Simply convert J to kJ by dividing by 1000. Since 1 kJ=1000 J. You would use the moles of the product.

Is kJ mol the same as kJ?

Usually it seems that delta H for an entire reaction is in kJ, since there are varying numbers of moles depending on which product or reactant it is. If the question asks for kJ per mole of product, then you would have to divide the enthalpy by the specific number of moles and give the answer in kJ/mole.

How do you convert kJ mol 1 to kJ G 1?

In order to convert kilojoules per gram to kilojoules per mole, you need to multiply by grams per mole. Now, let’s say that you’re dealing with a compound that has a molar mass of x g mol−1 . This tells you that 1 mole of this compound has a mass of x g .

How do you calculate joules released?

To calculate the amount of heat released in a chemical reaction, use the equation Q = mc ΔT, where Q is the heat energy transferred (in joules), m is the mass of the liquid being heated (in kilograms), c is the specific heat capacity of the liquid (joule per kilogram degrees Celsius), and ΔT is the change in …

How do you calculate joules?

In equation form: work (joules) = force (newtons) x distance (meters), where a joule is the unit of work, as defined in the following paragraph. In practical terms, even a small force can do a lot of work if it is exerted over a long distance.

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How do you calculate wavelength from KJ mol?

A slightly different way would be to use Eλ = hc (with the wavelength in meters) and solve for E, then multiply the answer times Avogadro’s Number. Finally, divide by 1000 to get kJ/mol.

How do you convert from J mol to KJ mol?


  1. 1 J/mol = 0.001 kj/mol. 2 J/mol = 0.002 kj/mol.
  2. 3 J/mol = 0.003 kj/mol. 4 J/mol = 0.004 kj/mol.
  3. 5 J/mol = 0.005 kj/mol. 6 J/mol = 0.006 kj/mol.
  4. 7 J/mol = 0.007 kj/mol. 8 J/mol = …
  5. 9 J/mol = 0.009 kj/mol. 10 J/mol = …
  6. 11 J/mol = 0.011 kj/mol. 12 J/mol = …
  7. 13 J/mol = 0.013 kj/mol. 14 J/mol = …
  8. 15 J/mol = 0.015 kj/mol. 16 J/mol =

How do you find QRXN in chemistry?

qrxn = – qcalorimeter 3. Divide qrxn by the number of moles of the limiting reactant. Multiply by the coefficient of the LR in the balanced equation to get ∆E for the reaction as written. For either of these types of calorimetry (coffee-cup or bomb), once you know ∆H or ∆E, you can easily calculate the other.